```
def is_prime(x):
if x <2:
return False
else:
for n in range(2, x-1):
if x %n == 0:
return False
return True
```

```
def is_prime(x):
if x <2:
return False
else:
for n in range(2, x):
if x %n == 0:
return False
return True
```

whether i write range 2 to x or 2 to x-1, i still passed the test. why?